Aeroacoustic source term filtering based on Helmholtz decomposition

  title={Aeroacoustic source term filtering based on Helmholtz decomposition},
  author={Stefan Schoder and Manfred Kaltenbacher},
Hybrid aeroacoustic methods seek for computational efficiency and robust noise prediction. Using already existing aeroacoustic wave equations, we propose a general hybrid aeroacoustic method, based on compressible source data. The main differences to current state of the art aeroacoustic analogies are that an additional decomposition is used to compute the aeroacoustic source terms and their application is extended to the source formulation, based on compressible flow data. By applying the… 

Figures from this paper


Perturbed Compressible Equations for Aeroacoustic Noise Prediction at Low Mach Numbers
A revised formulation of a hydrodynamic/acoustic splitting method is proposed for aeroacoustic noise prediction of wall-bounded shear flows at low Mach numbers. Based on the analysis of perturbed
Aeroacoustic tonal noise prediction of open cavity flows involving feedback
Abstract A new hydrodynamic/acoustic splitting method isemployed to predict aeroacoustic tonal noise of self-sustained oscillatory flows over the open cavity at low Mach numbers. Acoustic field is
Accurate CAA-Simulations using a Low-Mach Aerodynamic/Acoustic Splitting Technique
Hybrid CAA-approaches are commonly used for aero-acoustic engineering applications. For these kinds of numerical techniques, the computational domain is split into a noise generating region, where an
Computation of Flow Noise Using Source Terms in Linearized Euler's Equations
An acoustic analogy using linearized Euler’ s equations (LEE) forced with aerodynamic source terms is investigated to computetheacousticfare eld. Thishybridmethod isappliedto
Modeling and Finite Element Formulation for Acoustic Problems Including Rotating Domains
A finite element formulation for the efficient numerical simulation of sound in computational domains, including rotating regions, is presented. The mathematical description is based on an arbitrary
On the generation of sound by supersonic turbulent shear layers
A theory is proposed to describe the generation of sound by turbulence at high Mach numbers. The problem is formulated most conveniently in terms of the fluctuating pressure, and a convected wave
On sound generated aerodynamically II. Turbulence as a source of sound
  • M. Lighthill
  • Physics
    Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
  • 1954
The theory of sound generated aerodynamically is extended by taking into account the statistical properties of turbulent airflows, from which the sound radiated (without the help of solid boundaries)
Computational Aeroacoustics for Rotating Systems with Application to an Axial Fan
A hybrid aeroacoustic formulation, which is well suited for the computation of rotating systems, is presented. It is based on a decomposition of flow (incompressible part) and acoustic (compressibl...